Harrow-tooth fastening.



Patente'd Oct. I7, |899.

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nirrn JOI-IN O. TUNNIOLIFF, OF MOLINE, ILLINOIS, ASSIGNOR TO TIIE D. M. SECHLER CARRIAGE COMPANY, OF 4SAME PLACE.

HARROW-TOOTH FASTENING.

SPECIFICATION forming part of Letters Patent No. 635,111, dated Cctober 17, 1899. Application nea time 27,1599. sentito. 722,026. da man.)

To all whom tmc/y concern:

Be it known that I, JOHN C. TUNNIcLIn-F, a

citizen of the United States, residing at Moline, in the county of Rock Island and State of Illinois, have invented certain new and useful Improvements in Harrow-Tooth Fas tenings, of which the following is a specification.

This invention relates to improvements in harrow-tooth fastenings, and has for its primary object to provide for securing the har row-teeth to the bottom of a harrow-section by clamping alone without'necessity for perforating the teeth or having any adj ustability between the clamping device and the harrowbeam.

Another object is to have the barrow-tooth readily adjustable with relation to its fastening device, so that it may be adjusted to varying lengths with relation to the harrow-bealn or turned end for end with relation thereto and yet be firmly and rigidly secured in any adjusted position without injury thereto.

A further object is to simplify the construction and cheapen the cost of manufacture of harrow-sections, and particularly of the de vices for attaching the teeth to the sections.

These and such other objects as may hereinafter appear are attained by the devices illustrated in the accompanying drawings, in which- Figure l represents a section through a harrow-beam, showing the teeth and fastening devices in side elevation. Fig. 2 is a view similar to Fig. l, but taken from the opposite side of the teeth and fastening devices. Fig. 3 is rear elevation of Fig. I as viewed from a position at right angles to the rear face of the teeth. Fig. l is a transverse section on the line 4 4. of Fig. l looking in the direction indicated by the arrows, showing the parts in position before being tightened. v Fig. 5 is a view similar to Fig. et, but showing the parts tightened. Fig. 6 is a section on the line 6 6 of Fig. 5 looking in the direction indicated by the arrows. Fig. 7 is a perspective view ofthe larger clamp-plate, and Fig. 8 is a perspective view of the small clam p-plate shown upside down.

Similar letters of reference indicate the same parts in the several figures of the drawn ings.

I have shown my fastening device as applied to a steel barrow-beam A, which is curved or concave in cross-section in the direction in which the harrow is to be drawn, this style of harrow-beam being economical and furnishing an especially advantageous construction for the attachment of my fastening device; but I may here state that my device by proper change in the face ofthe larger der C at the lower edge thereof, against which the lower edge of the beam abuts. This clamping-plate and the beam are perforated at a point preferably corresponding to the center of the plate, as illustrated more clearly in Fig. 6, to receive a bolt D of suitable length and preferably squared along the part thereof extending through the beam and larger clamping-plate to prevent rotation of the bolt D. The opposite end of this bolt passes centrally through a small clamp-plate E and is provided with a nut F, screwed thereto upon the end of the bolt, by means of which the small clamp-plate may be forced down toward the larger clampplate.

Between the clamp-plates B and E and at one side of the bolt D is inserted the harrowtooth G, which I prefer should be a short section of asteel bar wedge-shaped or triangular in cross-section, as more clearly illustrated in Fig. 5, the apex or'sharp edge of said bar opposing the larger clamp-plate, while the broad edge of said bar opposes the small .depending lugs ly-ing upon one side of the tooth, while upon the opposite side of the tooth said plate is provided at its opposite edges with depending lugs I. The distance between the bases of the shoulder I-I and the lugs I is intended `to correspond substantially with the width of the side edge of the harrow-tooth, while the opposing inner faces of said shoulder and lugs are arranged at such an angle that before the tightening-nut F is screwed up the clamp-plate assumes a slightlyangular' position with relation to the tooth; but when the nut is tightened up the clampplate is brought down to a position at right angles to the tooth, at which time the lugs I, which are about twice the length of the shoulder H, bear against the side of the tooth, while said shoulder is clear of the tooth, as illus` trated in Fig. 5.

The larger clamp-plate is provided with three lugs J and K K along its length in staggered relation, the lug J being substantially at the center of length of the clamp-plate at one side of the line of the tooth, while the other lugs K K are near the ends of the plate on the opposite side of said line. The opposing inner faces of these lu gs-that is, the face of the lug J with relation to the faces of the lugs K K-converge toward the body of the plateon lines substantially corresponding with the tapering sides of the barrow-tooth, crossing each other slightlyT above the body of the plate, but are intended to be so disposed that when the clamp is tightened the edge of the tooth does not extend quite down to the body of the plate, and hence the tooth will be caused to wedge in between the lugs J and K K when the fastening device is tightened up.

By reason of the staggered relation between the lugsJ and K K when theedge of the harrow-tooth is forced down so that it is clamped between said lugs with a proper degree of force to hold the tooth immovable in position the lower edge or that part of the tooth between the lugs K K is sprung laterally slightly out of line by contact with the lugl J, which serves to fiX the tooth firmly against endwise movement. The laterally disposed lugs I upon the small clamp plate or cap being out of contact with the side of the tooth causes the lugs I to exert a slight lateral force on the tooth when the fastening device is tightened, thus serving as a means auxiliary to the staggered lugs J and K K to hold the tooth against endwise movement.

As the tooth is formed of steel, the effect of the clamp-plates thereon is to simply spring the tooth laterally and not bend and set the same, so that the tooth may be readily adjusted lengthwise in the clamp, so as to cause it to extend a greater or less distance from the barrow-beam.

A harrow-tooth fastening embodying my invention is simple in construction, is easy to apply and adjust, and is comparatively inexpensive, as all parts thereof, except the bolt, 6 5

` arrangement of the parts may be made, such as the means for attaching the larger clampplate to the barrow-beam or providing against movement thereof upon the beam, as well as in the shape of the clamp-plates and the lugs thereon, without departing from the spirit of my invention so long as such changes attain the objects thereof, and hence all such changes are within the purview of'myinvention.

Having thus fully described my invention,- what I claim, and desire to Asecure by Letters Patent, is-

l. The combination with a barrow-tooth beam," of a tooth-fastener comprising a pair of clamping-plates, a barrow-tooth, wedgeshaped in cross-section, interposed between said plates and a tightening,` bolt passing through said plates at one side of said tooth,- substantially as described.

2. The combination with a barrow-tooth beam and a harrow-tooth, wedge-shaped in cross-section, of a pair of clamping-plates each provided with opposing lugs, between which said tooth is held, and a tighteningbolt passing through said plates at one side of said tooth, substantially as described.

3. The combination with a harrow-tooth beam and a harrow-tooth, wedge-shaped in cross-section, of a pair of clamping-plates each provided with opposing lugs between which said tooth is held, and a tighteningbolt passing through said plates at one side of said tooth, the lugs of one of said plates being arranged in staggered relation, substantially as and for the purpose described.

4. The combination with a harroW-tooth beam and a harrow-tooth, wedge-shaped in cross-section, of a pair of clamping-plates each provided with opposing lugs, between which said tooth is held, and a tighteningbolt passing through said plates at one side of said tooth, the opposing faces of the lugs on one of said plates being so disposed that both of said faces cannot simultaneously come in contact with the tooth, substantially as and for the purpose described.

5. The combination with a barrow-tooth beam and a barrow-tooth, wedge-shaped in cross-section, of a pair of clamping-plates each provided with opposing lugs, between which said tooth is held, and a tighteningbolt passing through said plates at one side of said tooth, the opposing faces of the lugs on one of said plates being so disposed that both of said faces cannot simultaneously come in contact with the tooth, and the lugs of the other plate being arranged in staggered relation, substantially as and for the purpose set forth.

6. The combination with a harrow-toot-h IIC IZ-O

beam and a hairoW-tooth, Wedge-shaped in I plates ou oneside of the tooth than those on cross-section, of a pair of clamping-plates the other side of the tooth, substantially as each provided With opposing lugs, between described. which said tooth is held, and a tighteningl JOHN C. TUNN,ICLIFF-a Witnesses:

H. M. RossITER, W. J. DAVIS.

bolt passing through said plates at one side of said tooth, one set of lugs on eaeh of said plates extending a greater distance from the 

